Warning: Undefined variable $filename in /mnt/web521/e3/74/5522174/htdocs/download.php on line 52

Deprecated: fopen(): Passing null to parameter #1 ($filename) of type string is deprecated in /mnt/web521/e3/74/5522174/htdocs/download.php on line 52

Fatal error: Uncaught ValueError: Path cannot be empty in /mnt/web521/e3/74/5522174/htdocs/download.php:52
Stack trace:
#0 /mnt/web521/e3/74/5522174/htdocs/download.php(52): fopen('', 'rb')
#1 {main}
  thrown in /mnt/web521/e3/74/5522174/htdocs/download.php on line 52